Big Bird becomes ill enough that Maria must take him to the hospital, where the mystery is removed from simple procedures as blood tests and x-rays. Poor Big Bird must stay a few days, but the gang comes to visit and finally his Doctor,… MoreBig Bird becomes ill enough that Maria must take him to the hospital, where the mystery is removed from simple procedures as blood tests and x-rays. Poor Big Bird must stay a few days, but the gang comes to visit and finally his Doctor, Klein, says he can return to his nest.